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begin morning nautical twilight

   Also found in: Acronyms 0.01 sec.
The start of that period where, in good conditions and in the absence of other illumination, enough light is available to identify the general outlines of ground objects and conduct limited military operations. Light intensification devices are still effective and may have enhanced capabilities. At this time, the sun is 12 degrees below the eastern horizon. Also called BMNT.


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The event must be at night beyond the end of evening nautical twilight and prior to begin morning nautical twilight.
 
 
 
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